Doing this with a 32-bit only Perl is a tad more complex, but works. You break the 64-bit number into 2 32-bit values and then multiply them out. You do have to pay attention to endianess though. 

#! perl -slw
use strict;
use constant {
    MSEpoch_2_UnixEpoch => 116444736000000000,
};

my $in = '0x50c2b17c7c04c9014c69ac817f04c90176b7ed3581f7ca01ee1183dede
+a3c901';

my @hexTimes = unpack 'xx(A16)4', $in;

my @binTimes = map{
    my( $lo, $hi ) = unpack 'VV', pack 'H8H8', unpack 'A8A8', $_;
    $hi * 2**32 + $lo
} @hexTimes;

my @unixTimes = map{ ( $_ - MSEpoch_2_UnixEpoch ) /1e7 } @binTimes;

print scalar localtime( $_ ) for @unixTimes;

__END__
[13:52:05.69]C:\test>845551.pl
Fri Aug 22 17:28:27 2008
Fri Aug 22 17:50:03 2008
Wed May 19 18:29:26 2010
Fri Mar 13 13:23:16 2009

[download]
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
RIP an inspiration; A true Folk's Guy

In reply to Re^2: unpack'ing "64-bit quantities" by BrowserUk
in thread unpack'ing "64-bit quantities" by isync

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.